I agree with LilShawn for the most part, but...
The G07 is starting to show its age. The original flybacks on these are failing in droves. They've reached the end of their usable life. If it's original, I'd advocate replacing it. You can tell if it's original if it's grey. If it's white, it's a replacement.
Often, capping the monitor puts stress on the original flyback, and it can react violently!